Re: Creating a stencil from a markup

[David Nalesnik]

On Wed, Dec 14, 2016 at 2:57 PM, David Nalesnik
<address@hidden> wrote:
> Hi Simon,
>
> On Wed, Dec 14, 2016 at 2:20 PM, Simon Albrecht <address@hidden> wrote:
>> Hello everybody,
>>
>> I’d like to add a caesura sign on top of a barline by modifying the
>> barline’s stencil. Here’s my attempt:
>>
>> %%%%%%%%%%%%%%%%%%
>> \version "2.19.49"
>>
>> {
>>   1
>>   \once\override BarLine.stencil =
>>   #(ly:stencil-combine-at-edge
>>      ly:bar-line::print
>>      1 ; y-axis
>>      1 ; on top
>>      (interpret-markup layout props (make-musicglyph-markup
>> "scripts.caesura.curved"))
>>      2) %padding
>>   1
>> }
>> %%%%%%%%%%%%%%%%%%
>>
>> However, layout is an unbound variable here (and so is props, I assume). How
>> to do it correctly?
>>
>
> Try:
>
> {
>   1
>   \once\override Staff.BarLine.stencil =
>   #(lambda (grob)
>      (let ((layout (ly:grob-layout grob)))
>        (ly:stencil-combine-at-edge
>         (ly:bar-line::print grob)
>         1 ; y-axis
>         1 ; on top
>         (interpret-markup
>          layout
>          (ly:grob-alist-chain grob (ly:output-def-lookup layout
> 'text-font-defaults))
>          (make-musicglyph-markup "scripts.caesura.curved"))
>         2))) %padding
>   1
> }
>
> Best,
> David


For documentation, look at ly:text-interface::interpret-markup here:
http://lilypond.org/doc/v2.18/Documentation/internals/scheme-functions